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“It’s just fun to see them laugh and relax and have fun and realize how much they actually learned," said AP biology teacher Kim Popham, who recently guided her students on a tour of Yellowstone National Park.

United statesWest yellowstoneSerbia generalBelgrade high schoolBob fuhrmannKim pophamAndy hessenYellowstone national parkAmerican psychology associationYellowstone nationalBelgrade highJess sheldahlYellowstone public radioNational park